Locking device for change-speed gears.



G. s-CHLATTER. v LOCKING DEVICE FOR CHANGE SPEED GERS.

' .APPLICATION FILEI) DEC: SI. I9II5- I 'Patented Mar. 27,1917.

e stratus ramena? on F ARBON, SWITZERLAND, ASSXGNOR TO THE Id .lhlltltitfzl i' SAUBER, 0F A RBGN, SWIITZIERLAND.

LKNG DEVGE FOR CHANGE-SPEED GELES.

mummia Specification of Letters Patent. llgb'tcgntdl Mimi?, 2., 4illllllh Application led Becember 31, 1915. Serial No. 69,599.

To @ZE whom t may concern:

Be it known that l, GUs'rAv SCHLATTER, engineer, a citizen of the Swiss Republic, and resident et Arbon, Switzerland, have invented a certain new andvuseful Locking' Device for Change-Speed Gears,.of which the iollowing is a specification.

ylhis invention relates to a locking device ii'or change speed gears of the gate type. ln this type,l the change-speed lever is connected wit a shitting lever or coupling` arm which in its turn may be brought into engagement with a number oi shifting rods to effect the changes of, speed. The changespeed lever is adapted to be turned .about its axis and also to be moved laterally, that is, lengthwise of said axis. ln such gears, it is old to provide stops ,for preventing accidental movement of the shitting; rods and connect with the change-speed lever alocking device which, when the lever is moved axiallynreleasesnly the stop oli the shitting rod which it is desired to operate.

ln the locking devices of this kind constructed heretofore, the locking member was a slide and rigidly connected to the change- Speed lever in the axial movement of which it took part. rlhis form of locking member has serious drawbacks. .lt must have coin- 'paratively long guides in order to keep it in line and to prevent jamming so that it will work smoothly, but there is generally no room for such long guides, and in any case a slide so guided has great frictional resistance. This is the more inconvenient as moving the change speed lever axiallyl requires more power than turning` it on its axis.l and so it should be avoided to cause an additional resist-ance to such movement.

The present invention overcomes these drawbacks by providing a locking member which instead of sliding, only swings over the stops of the shittingrods and, on the change-speed lever beine.r moved axially, re leases only the stop of the shifting; rod which it is desired to operate. This not only affords an easy movement of the locking mein- .ber but also the possibility ot providing a fairly long bearing' l'for its pivot and so increasing its reliability. 'lhere will always be room for a bearing' or" the desired length.

lleierenrce is to he had to the accompanying drawing' in which an example of the new locking device is shown.

Figure l is an elevation, partly in section .ing rods.

on line A B of Fig. 2,@and Fig. 2 is a plan View, also. partly in section.

The change-speed lever 1 is, in the` usual manner, adapted to be turned and to be moved laterally, that is, lengthwise ofthe axis of its fulcrum rod 2. The shifting lever or coupling arm 3 may engage projections 4 and 5 oneach. shifting' rod 6, Y and 8. This coupling arm or Speedchanging shifting lever 3 is held to move in unison with the leveror manually-operated controller l, and this vmay be accomplished by securing both the lever 1 and the lever 8 rigidly to the rod 2, and mounting the latter so that it lnay both slide lengthwise or axially and also rock in its bearings. A bush 9 is ar` ranged to move in unison with the levers 1 and 3, say by securing,` the bush rigidly to the rod 2 when the latter, as just set forth, is constructed as a sliding` rock shaft with the levers 1 and 3 secured to it rigidly. The

said bush is provided with two, projections 10 and 11 engaging one end l2 oit a lever 1li turning* on a pivot 18. The other end ofA this lever is aI plate l5 provided with holes 1G, 17 and 18 and forms the locking member for the stops of the shifting rods.

The shifting rods 6, 7 and 8 are in the usual manner connected with stops 19, and 21, each of which has a ball 22 resting in a recess 25 of the corresponding shifting; rod, and a pin 24 formed/into `a piston at its lower end and pressed down by a spring 23. All three stops are arranged in a block 26 which also forms a bearing; 27 for the pivot 13 of lever 1l. This bearing` can be made comparatively longs,` because it is in close vicinity to the stops the bore-s tor which must obviously be rather long.

The holes 16, 17 and 18 are'so arranged in the locking plate 15 that, when the change-speed lever 1, and with it sleeve il, is-moved laterally, that is lengthwise of the axis of rod 2, thereby turning lever 14:, one of these holes is caused to register with the stop of the shifting rod which it 'is desired to operate, while the other two stops are prevented from upward movementby the solid part of locking plate 15 so that they are unable to release the corresponding shift ln the position ot parte illustrated, the shitting1 lever 3 is between the projectimisl d and li on shifting rod 7, and hole 17 is in line with the stop 20 o'lE this shifting rod. Consequently, this' shitting;

Sil

,rod `free to move when lever l is turned on its fulcrum rod 2, forcing the ball Q2 of the shifting rod,7 out 'of its recess 25 against the action of spring` 23. At the -same time, pin Ql'enters the hole 17 above it,v .A It will be'observed that the axes of the stops 19, '20, 21, andthe direction in which .saidstops move or slide, are vertical, and

against accidental movement, a speed-chang? 'ing shifting lever movable laterally to bring` it into operative relation to one or the other offsaid shifting rods, a swinging locking"l member operatively connected with .sald

lever and arranged to lock said stopsselectively, the axes of said stops being at right angles to the plane 1n which said locking memlr is adaptedy'to swing.

2. shifting rods, stopsior holding said/rods speed-changing gearA comprising against accidental movement, a speed-chan@ ing shiftingl lever movable laterally to bring it into operative relation to one or the other of said shifting` rods, a swinging" lockilmr member operatively connected v.Tith said leverand arranged to swing to lock the stops of those shifting rods which at the time are not operatively connected with the speedchanging lever, '.while releasing' the stop of the shifting' rod temporarily connected with said lever.

3. A speed-changing gear comprising' shifting rods, stops for holding said Vrods against accidental movement, a speed-changing lshifting lever movable laterally to bring:` it into operative relation to one 0r the other of said shifting rods, an iI-nlependently pivoted member operatively connected with the speedchanging lever and adapted to be swung on its pivot bythe lateral shifting' oi said lever, to loclcsaidstops selec'zti'vely.

In testimony whereof, I have .signed Vthis specification.

'GUSTAV SCHLATTER. 

